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a6b1d82d07
gcc emits the following warning on a 'allmodconfig' build: fs/jffs2/xattr.c: In function ‘unrefer_xattr_datum’: fs/jffs2/xattr.c:402: warning: unused variable ‘version’ fs/jffs2/xattr.c:402: warning: unused variable ‘xid’ Given that these variables are only used in the debug printk, and they merely remove a deref, we can easily kill the warning by adding the derefs to the debug printk. Signed-off-by: Jeff Garzik <jeff@garzik.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
1324 lines
38 KiB
C
1324 lines
38 KiB
C
/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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*
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* Copyright (C) 2006 NEC Corporation
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*
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* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/time.h>
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/crc32.h>
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#include <linux/jffs2.h>
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#include <linux/xattr.h>
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#include <linux/mtd/mtd.h>
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#include "nodelist.h"
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/* -------- xdatum related functions ----------------
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* xattr_datum_hashkey(xprefix, xname, xvalue, xsize)
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* is used to calcurate xdatum hashkey. The reminder of hashkey into XATTRINDEX_HASHSIZE is
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* the index of the xattr name/value pair cache (c->xattrindex).
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* is_xattr_datum_unchecked(c, xd)
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* returns 1, if xdatum contains any unchecked raw nodes. if all raw nodes are not
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* unchecked, it returns 0.
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* unload_xattr_datum(c, xd)
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* is used to release xattr name/value pair and detach from c->xattrindex.
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* reclaim_xattr_datum(c)
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* is used to reclaim xattr name/value pairs on the xattr name/value pair cache when
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* memory usage by cache is over c->xdatum_mem_threshold. Currentry, this threshold
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* is hard coded as 32KiB.
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* do_verify_xattr_datum(c, xd)
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* is used to load the xdatum informations without name/value pair from the medium.
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* It's necessary once, because those informations are not collected during mounting
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* process when EBS is enabled.
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* 0 will be returned, if success. An negative return value means recoverable error, and
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* positive return value means unrecoverable error. Thus, caller must remove this xdatum
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* and xref when it returned positive value.
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* do_load_xattr_datum(c, xd)
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* is used to load name/value pair from the medium.
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* The meanings of return value is same as do_verify_xattr_datum().
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* load_xattr_datum(c, xd)
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* is used to be as a wrapper of do_verify_xattr_datum() and do_load_xattr_datum().
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* If xd need to call do_verify_xattr_datum() at first, it's called before calling
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* do_load_xattr_datum(). The meanings of return value is same as do_verify_xattr_datum().
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* save_xattr_datum(c, xd)
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* is used to write xdatum to medium. xd->version will be incremented.
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* create_xattr_datum(c, xprefix, xname, xvalue, xsize)
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* is used to create new xdatum and write to medium.
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* unrefer_xattr_datum(c, xd)
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* is used to delete a xdatum. When nobody refers this xdatum, JFFS2_XFLAGS_DEAD
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* is set on xd->flags and chained xattr_dead_list or release it immediately.
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* In the first case, the garbage collector release it later.
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* -------------------------------------------------- */
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static uint32_t xattr_datum_hashkey(int xprefix, const char *xname, const char *xvalue, int xsize)
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{
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int name_len = strlen(xname);
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return crc32(xprefix, xname, name_len) ^ crc32(xprefix, xvalue, xsize);
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}
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static int is_xattr_datum_unchecked(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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struct jffs2_raw_node_ref *raw;
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int rc = 0;
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spin_lock(&c->erase_completion_lock);
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for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
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if (ref_flags(raw) == REF_UNCHECKED) {
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rc = 1;
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break;
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}
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}
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spin_unlock(&c->erase_completion_lock);
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return rc;
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}
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static void unload_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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/* must be called under down_write(xattr_sem) */
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D1(dbg_xattr("%s: xid=%u, version=%u\n", __FUNCTION__, xd->xid, xd->version));
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if (xd->xname) {
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c->xdatum_mem_usage -= (xd->name_len + 1 + xd->value_len);
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kfree(xd->xname);
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}
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list_del_init(&xd->xindex);
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xd->hashkey = 0;
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xd->xname = NULL;
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xd->xvalue = NULL;
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}
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static void reclaim_xattr_datum(struct jffs2_sb_info *c)
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{
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/* must be called under down_write(xattr_sem) */
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struct jffs2_xattr_datum *xd, *_xd;
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uint32_t target, before;
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static int index = 0;
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int count;
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if (c->xdatum_mem_threshold > c->xdatum_mem_usage)
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return;
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before = c->xdatum_mem_usage;
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target = c->xdatum_mem_usage * 4 / 5; /* 20% reduction */
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for (count = 0; count < XATTRINDEX_HASHSIZE; count++) {
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list_for_each_entry_safe(xd, _xd, &c->xattrindex[index], xindex) {
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if (xd->flags & JFFS2_XFLAGS_HOT) {
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xd->flags &= ~JFFS2_XFLAGS_HOT;
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} else if (!(xd->flags & JFFS2_XFLAGS_BIND)) {
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unload_xattr_datum(c, xd);
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}
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if (c->xdatum_mem_usage <= target)
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goto out;
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}
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index = (index+1) % XATTRINDEX_HASHSIZE;
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}
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out:
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JFFS2_NOTICE("xdatum_mem_usage from %u byte to %u byte (%u byte reclaimed)\n",
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before, c->xdatum_mem_usage, before - c->xdatum_mem_usage);
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}
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static int do_verify_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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/* must be called under down_write(xattr_sem) */
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struct jffs2_eraseblock *jeb;
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struct jffs2_raw_node_ref *raw;
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struct jffs2_raw_xattr rx;
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size_t readlen;
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uint32_t crc, offset, totlen;
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int rc;
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spin_lock(&c->erase_completion_lock);
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offset = ref_offset(xd->node);
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if (ref_flags(xd->node) == REF_PRISTINE)
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goto complete;
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spin_unlock(&c->erase_completion_lock);
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rc = jffs2_flash_read(c, offset, sizeof(rx), &readlen, (char *)&rx);
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if (rc || readlen != sizeof(rx)) {
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JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu at %#08x\n",
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rc, sizeof(rx), readlen, offset);
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return rc ? rc : -EIO;
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}
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crc = crc32(0, &rx, sizeof(rx) - 4);
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if (crc != je32_to_cpu(rx.node_crc)) {
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JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
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offset, je32_to_cpu(rx.hdr_crc), crc);
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xd->flags |= JFFS2_XFLAGS_INVALID;
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return EIO;
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}
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totlen = PAD(sizeof(rx) + rx.name_len + 1 + je16_to_cpu(rx.value_len));
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if (je16_to_cpu(rx.magic) != JFFS2_MAGIC_BITMASK
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|| je16_to_cpu(rx.nodetype) != JFFS2_NODETYPE_XATTR
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|| je32_to_cpu(rx.totlen) != totlen
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|| je32_to_cpu(rx.xid) != xd->xid
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|| je32_to_cpu(rx.version) != xd->version) {
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JFFS2_ERROR("inconsistent xdatum at %#08x, magic=%#04x/%#04x, "
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"nodetype=%#04x/%#04x, totlen=%u/%u, xid=%u/%u, version=%u/%u\n",
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offset, je16_to_cpu(rx.magic), JFFS2_MAGIC_BITMASK,
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je16_to_cpu(rx.nodetype), JFFS2_NODETYPE_XATTR,
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je32_to_cpu(rx.totlen), totlen,
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je32_to_cpu(rx.xid), xd->xid,
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je32_to_cpu(rx.version), xd->version);
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xd->flags |= JFFS2_XFLAGS_INVALID;
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return EIO;
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}
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xd->xprefix = rx.xprefix;
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xd->name_len = rx.name_len;
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xd->value_len = je16_to_cpu(rx.value_len);
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xd->data_crc = je32_to_cpu(rx.data_crc);
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spin_lock(&c->erase_completion_lock);
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complete:
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for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
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jeb = &c->blocks[ref_offset(raw) / c->sector_size];
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totlen = PAD(ref_totlen(c, jeb, raw));
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if (ref_flags(raw) == REF_UNCHECKED) {
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c->unchecked_size -= totlen; c->used_size += totlen;
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jeb->unchecked_size -= totlen; jeb->used_size += totlen;
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}
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raw->flash_offset = ref_offset(raw) | ((xd->node==raw) ? REF_PRISTINE : REF_NORMAL);
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}
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spin_unlock(&c->erase_completion_lock);
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/* unchecked xdatum is chained with c->xattr_unchecked */
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list_del_init(&xd->xindex);
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dbg_xattr("success on verfying xdatum (xid=%u, version=%u)\n",
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xd->xid, xd->version);
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return 0;
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}
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static int do_load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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/* must be called under down_write(xattr_sem) */
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char *data;
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size_t readlen;
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uint32_t crc, length;
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int i, ret, retry = 0;
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BUG_ON(ref_flags(xd->node) != REF_PRISTINE);
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BUG_ON(!list_empty(&xd->xindex));
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retry:
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length = xd->name_len + 1 + xd->value_len;
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data = kmalloc(length, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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ret = jffs2_flash_read(c, ref_offset(xd->node)+sizeof(struct jffs2_raw_xattr),
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length, &readlen, data);
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if (ret || length!=readlen) {
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JFFS2_WARNING("jffs2_flash_read() returned %d, request=%d, readlen=%zu, at %#08x\n",
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ret, length, readlen, ref_offset(xd->node));
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kfree(data);
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return ret ? ret : -EIO;
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}
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data[xd->name_len] = '\0';
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crc = crc32(0, data, length);
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if (crc != xd->data_crc) {
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JFFS2_WARNING("node CRC failed (JFFS2_NODETYPE_XREF)"
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" at %#08x, read: 0x%08x calculated: 0x%08x\n",
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ref_offset(xd->node), xd->data_crc, crc);
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kfree(data);
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xd->flags |= JFFS2_XFLAGS_INVALID;
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return EIO;
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}
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xd->flags |= JFFS2_XFLAGS_HOT;
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xd->xname = data;
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xd->xvalue = data + xd->name_len+1;
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c->xdatum_mem_usage += length;
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xd->hashkey = xattr_datum_hashkey(xd->xprefix, xd->xname, xd->xvalue, xd->value_len);
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i = xd->hashkey % XATTRINDEX_HASHSIZE;
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list_add(&xd->xindex, &c->xattrindex[i]);
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if (!retry) {
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retry = 1;
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reclaim_xattr_datum(c);
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if (!xd->xname)
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goto retry;
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}
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dbg_xattr("success on loading xdatum (xid=%u, xprefix=%u, xname='%s')\n",
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xd->xid, xd->xprefix, xd->xname);
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return 0;
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}
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static int load_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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/* must be called under down_write(xattr_sem);
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* rc < 0 : recoverable error, try again
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* rc = 0 : success
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* rc > 0 : Unrecoverable error, this node should be deleted.
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*/
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int rc = 0;
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BUG_ON(xd->flags & JFFS2_XFLAGS_DEAD);
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if (xd->xname)
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return 0;
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if (xd->flags & JFFS2_XFLAGS_INVALID)
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return EIO;
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if (unlikely(is_xattr_datum_unchecked(c, xd)))
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rc = do_verify_xattr_datum(c, xd);
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if (!rc)
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rc = do_load_xattr_datum(c, xd);
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return rc;
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}
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static int save_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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/* must be called under down_write(xattr_sem) */
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struct jffs2_raw_xattr rx;
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struct kvec vecs[2];
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size_t length;
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int rc, totlen;
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uint32_t phys_ofs = write_ofs(c);
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BUG_ON(!xd->xname);
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BUG_ON(xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID));
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vecs[0].iov_base = ℞
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vecs[0].iov_len = sizeof(rx);
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vecs[1].iov_base = xd->xname;
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vecs[1].iov_len = xd->name_len + 1 + xd->value_len;
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totlen = vecs[0].iov_len + vecs[1].iov_len;
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/* Setup raw-xattr */
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memset(&rx, 0, sizeof(rx));
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rx.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
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rx.nodetype = cpu_to_je16(JFFS2_NODETYPE_XATTR);
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rx.totlen = cpu_to_je32(PAD(totlen));
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rx.hdr_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_unknown_node) - 4));
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rx.xid = cpu_to_je32(xd->xid);
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rx.version = cpu_to_je32(++xd->version);
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rx.xprefix = xd->xprefix;
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rx.name_len = xd->name_len;
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rx.value_len = cpu_to_je16(xd->value_len);
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rx.data_crc = cpu_to_je32(crc32(0, vecs[1].iov_base, vecs[1].iov_len));
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rx.node_crc = cpu_to_je32(crc32(0, &rx, sizeof(struct jffs2_raw_xattr) - 4));
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rc = jffs2_flash_writev(c, vecs, 2, phys_ofs, &length, 0);
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if (rc || totlen != length) {
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JFFS2_WARNING("jffs2_flash_writev()=%d, req=%u, wrote=%zu, at %#08x\n",
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rc, totlen, length, phys_ofs);
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rc = rc ? rc : -EIO;
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if (length)
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jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(totlen), NULL);
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return rc;
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}
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/* success */
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jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(totlen), (void *)xd);
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dbg_xattr("success on saving xdatum (xid=%u, version=%u, xprefix=%u, xname='%s')\n",
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xd->xid, xd->version, xd->xprefix, xd->xname);
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return 0;
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}
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static struct jffs2_xattr_datum *create_xattr_datum(struct jffs2_sb_info *c,
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int xprefix, const char *xname,
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const char *xvalue, int xsize)
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{
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/* must be called under down_write(xattr_sem) */
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struct jffs2_xattr_datum *xd;
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uint32_t hashkey, name_len;
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char *data;
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int i, rc;
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/* Search xattr_datum has same xname/xvalue by index */
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hashkey = xattr_datum_hashkey(xprefix, xname, xvalue, xsize);
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i = hashkey % XATTRINDEX_HASHSIZE;
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list_for_each_entry(xd, &c->xattrindex[i], xindex) {
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if (xd->hashkey==hashkey
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&& xd->xprefix==xprefix
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&& xd->value_len==xsize
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&& !strcmp(xd->xname, xname)
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&& !memcmp(xd->xvalue, xvalue, xsize)) {
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atomic_inc(&xd->refcnt);
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return xd;
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}
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}
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/* Not found, Create NEW XATTR-Cache */
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name_len = strlen(xname);
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xd = jffs2_alloc_xattr_datum();
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if (!xd)
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return ERR_PTR(-ENOMEM);
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data = kmalloc(name_len + 1 + xsize, GFP_KERNEL);
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if (!data) {
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jffs2_free_xattr_datum(xd);
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return ERR_PTR(-ENOMEM);
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}
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strcpy(data, xname);
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memcpy(data + name_len + 1, xvalue, xsize);
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atomic_set(&xd->refcnt, 1);
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xd->xid = ++c->highest_xid;
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xd->flags |= JFFS2_XFLAGS_HOT;
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xd->xprefix = xprefix;
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xd->hashkey = hashkey;
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xd->xname = data;
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xd->xvalue = data + name_len + 1;
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xd->name_len = name_len;
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xd->value_len = xsize;
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xd->data_crc = crc32(0, data, xd->name_len + 1 + xd->value_len);
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rc = save_xattr_datum(c, xd);
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if (rc) {
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kfree(xd->xname);
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jffs2_free_xattr_datum(xd);
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return ERR_PTR(rc);
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}
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/* Insert Hash Index */
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i = hashkey % XATTRINDEX_HASHSIZE;
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list_add(&xd->xindex, &c->xattrindex[i]);
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c->xdatum_mem_usage += (xd->name_len + 1 + xd->value_len);
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reclaim_xattr_datum(c);
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return xd;
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}
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static void unrefer_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
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{
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/* must be called under down_write(xattr_sem) */
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if (atomic_dec_and_lock(&xd->refcnt, &c->erase_completion_lock)) {
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unload_xattr_datum(c, xd);
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|
xd->flags |= JFFS2_XFLAGS_DEAD;
|
|
if (xd->node == (void *)xd) {
|
|
BUG_ON(!(xd->flags & JFFS2_XFLAGS_INVALID));
|
|
jffs2_free_xattr_datum(xd);
|
|
} else {
|
|
list_add(&xd->xindex, &c->xattr_dead_list);
|
|
}
|
|
spin_unlock(&c->erase_completion_lock);
|
|
|
|
dbg_xattr("xdatum(xid=%u, version=%u) was removed.\n",
|
|
xd->xid, xd->version);
|
|
}
|
|
}
|
|
|
|
/* -------- xref related functions ------------------
|
|
* verify_xattr_ref(c, ref)
|
|
* is used to load xref information from medium. Because summary data does not
|
|
* contain xid/ino, it's necessary to verify once while mounting process.
|
|
* save_xattr_ref(c, ref)
|
|
* is used to write xref to medium. If delete marker is marked, it write
|
|
* a delete marker of xref into medium.
|
|
* create_xattr_ref(c, ic, xd)
|
|
* is used to create a new xref and write to medium.
|
|
* delete_xattr_ref(c, ref)
|
|
* is used to delete jffs2_xattr_ref. It marks xref XREF_DELETE_MARKER,
|
|
* and allows GC to reclaim those physical nodes.
|
|
* jffs2_xattr_delete_inode(c, ic)
|
|
* is called to remove xrefs related to obsolete inode when inode is unlinked.
|
|
* jffs2_xattr_free_inode(c, ic)
|
|
* is called to release xattr related objects when unmounting.
|
|
* check_xattr_ref_inode(c, ic)
|
|
* is used to confirm inode does not have duplicate xattr name/value pair.
|
|
* -------------------------------------------------- */
|
|
static int verify_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
|
|
{
|
|
struct jffs2_eraseblock *jeb;
|
|
struct jffs2_raw_node_ref *raw;
|
|
struct jffs2_raw_xref rr;
|
|
size_t readlen;
|
|
uint32_t crc, offset, totlen;
|
|
int rc;
|
|
|
|
spin_lock(&c->erase_completion_lock);
|
|
if (ref_flags(ref->node) != REF_UNCHECKED)
|
|
goto complete;
|
|
offset = ref_offset(ref->node);
|
|
spin_unlock(&c->erase_completion_lock);
|
|
|
|
rc = jffs2_flash_read(c, offset, sizeof(rr), &readlen, (char *)&rr);
|
|
if (rc || sizeof(rr) != readlen) {
|
|
JFFS2_WARNING("jffs2_flash_read()=%d, req=%zu, read=%zu, at %#08x\n",
|
|
rc, sizeof(rr), readlen, offset);
|
|
return rc ? rc : -EIO;
|
|
}
|
|
/* obsolete node */
|
|
crc = crc32(0, &rr, sizeof(rr) - 4);
|
|
if (crc != je32_to_cpu(rr.node_crc)) {
|
|
JFFS2_ERROR("node CRC failed at %#08x, read=%#08x, calc=%#08x\n",
|
|
offset, je32_to_cpu(rr.node_crc), crc);
|
|
return EIO;
|
|
}
|
|
if (je16_to_cpu(rr.magic) != JFFS2_MAGIC_BITMASK
|
|
|| je16_to_cpu(rr.nodetype) != JFFS2_NODETYPE_XREF
|
|
|| je32_to_cpu(rr.totlen) != PAD(sizeof(rr))) {
|
|
JFFS2_ERROR("inconsistent xref at %#08x, magic=%#04x/%#04x, "
|
|
"nodetype=%#04x/%#04x, totlen=%u/%zu\n",
|
|
offset, je16_to_cpu(rr.magic), JFFS2_MAGIC_BITMASK,
|
|
je16_to_cpu(rr.nodetype), JFFS2_NODETYPE_XREF,
|
|
je32_to_cpu(rr.totlen), PAD(sizeof(rr)));
|
|
return EIO;
|
|
}
|
|
ref->ino = je32_to_cpu(rr.ino);
|
|
ref->xid = je32_to_cpu(rr.xid);
|
|
ref->xseqno = je32_to_cpu(rr.xseqno);
|
|
if (ref->xseqno > c->highest_xseqno)
|
|
c->highest_xseqno = (ref->xseqno & ~XREF_DELETE_MARKER);
|
|
|
|
spin_lock(&c->erase_completion_lock);
|
|
complete:
|
|
for (raw=ref->node; raw != (void *)ref; raw=raw->next_in_ino) {
|
|
jeb = &c->blocks[ref_offset(raw) / c->sector_size];
|
|
totlen = PAD(ref_totlen(c, jeb, raw));
|
|
if (ref_flags(raw) == REF_UNCHECKED) {
|
|
c->unchecked_size -= totlen; c->used_size += totlen;
|
|
jeb->unchecked_size -= totlen; jeb->used_size += totlen;
|
|
}
|
|
raw->flash_offset = ref_offset(raw) | ((ref->node==raw) ? REF_PRISTINE : REF_NORMAL);
|
|
}
|
|
spin_unlock(&c->erase_completion_lock);
|
|
|
|
dbg_xattr("success on verifying xref (ino=%u, xid=%u) at %#08x\n",
|
|
ref->ino, ref->xid, ref_offset(ref->node));
|
|
return 0;
|
|
}
|
|
|
|
static int save_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
|
|
{
|
|
/* must be called under down_write(xattr_sem) */
|
|
struct jffs2_raw_xref rr;
|
|
size_t length;
|
|
uint32_t xseqno, phys_ofs = write_ofs(c);
|
|
int ret;
|
|
|
|
rr.magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
|
|
rr.nodetype = cpu_to_je16(JFFS2_NODETYPE_XREF);
|
|
rr.totlen = cpu_to_je32(PAD(sizeof(rr)));
|
|
rr.hdr_crc = cpu_to_je32(crc32(0, &rr, sizeof(struct jffs2_unknown_node) - 4));
|
|
|
|
xseqno = (c->highest_xseqno += 2);
|
|
if (is_xattr_ref_dead(ref)) {
|
|
xseqno |= XREF_DELETE_MARKER;
|
|
rr.ino = cpu_to_je32(ref->ino);
|
|
rr.xid = cpu_to_je32(ref->xid);
|
|
} else {
|
|
rr.ino = cpu_to_je32(ref->ic->ino);
|
|
rr.xid = cpu_to_je32(ref->xd->xid);
|
|
}
|
|
rr.xseqno = cpu_to_je32(xseqno);
|
|
rr.node_crc = cpu_to_je32(crc32(0, &rr, sizeof(rr) - 4));
|
|
|
|
ret = jffs2_flash_write(c, phys_ofs, sizeof(rr), &length, (char *)&rr);
|
|
if (ret || sizeof(rr) != length) {
|
|
JFFS2_WARNING("jffs2_flash_write() returned %d, request=%zu, retlen=%zu, at %#08x\n",
|
|
ret, sizeof(rr), length, phys_ofs);
|
|
ret = ret ? ret : -EIO;
|
|
if (length)
|
|
jffs2_add_physical_node_ref(c, phys_ofs | REF_OBSOLETE, PAD(sizeof(rr)), NULL);
|
|
|
|
return ret;
|
|
}
|
|
/* success */
|
|
ref->xseqno = xseqno;
|
|
jffs2_add_physical_node_ref(c, phys_ofs | REF_PRISTINE, PAD(sizeof(rr)), (void *)ref);
|
|
|
|
dbg_xattr("success on saving xref (ino=%u, xid=%u)\n", ref->ic->ino, ref->xd->xid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct jffs2_xattr_ref *create_xattr_ref(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic,
|
|
struct jffs2_xattr_datum *xd)
|
|
{
|
|
/* must be called under down_write(xattr_sem) */
|
|
struct jffs2_xattr_ref *ref;
|
|
int ret;
|
|
|
|
ref = jffs2_alloc_xattr_ref();
|
|
if (!ref)
|
|
return ERR_PTR(-ENOMEM);
|
|
ref->ic = ic;
|
|
ref->xd = xd;
|
|
|
|
ret = save_xattr_ref(c, ref);
|
|
if (ret) {
|
|
jffs2_free_xattr_ref(ref);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/* Chain to inode */
|
|
ref->next = ic->xref;
|
|
ic->xref = ref;
|
|
|
|
return ref; /* success */
|
|
}
|
|
|
|
static void delete_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
|
|
{
|
|
/* must be called under down_write(xattr_sem) */
|
|
struct jffs2_xattr_datum *xd;
|
|
|
|
xd = ref->xd;
|
|
ref->xseqno |= XREF_DELETE_MARKER;
|
|
ref->ino = ref->ic->ino;
|
|
ref->xid = ref->xd->xid;
|
|
spin_lock(&c->erase_completion_lock);
|
|
ref->next = c->xref_dead_list;
|
|
c->xref_dead_list = ref;
|
|
spin_unlock(&c->erase_completion_lock);
|
|
|
|
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) was removed.\n",
|
|
ref->ino, ref->xid, ref->xseqno);
|
|
|
|
unrefer_xattr_datum(c, xd);
|
|
}
|
|
|
|
void jffs2_xattr_delete_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
|
|
{
|
|
/* It's called from jffs2_clear_inode() on inode removing.
|
|
When an inode with XATTR is removed, those XATTRs must be removed. */
|
|
struct jffs2_xattr_ref *ref, *_ref;
|
|
|
|
if (!ic || ic->nlink > 0)
|
|
return;
|
|
|
|
down_write(&c->xattr_sem);
|
|
for (ref = ic->xref; ref; ref = _ref) {
|
|
_ref = ref->next;
|
|
delete_xattr_ref(c, ref);
|
|
}
|
|
ic->xref = NULL;
|
|
up_write(&c->xattr_sem);
|
|
}
|
|
|
|
void jffs2_xattr_free_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
|
|
{
|
|
/* It's called from jffs2_free_ino_caches() until unmounting FS. */
|
|
struct jffs2_xattr_datum *xd;
|
|
struct jffs2_xattr_ref *ref, *_ref;
|
|
|
|
down_write(&c->xattr_sem);
|
|
for (ref = ic->xref; ref; ref = _ref) {
|
|
_ref = ref->next;
|
|
xd = ref->xd;
|
|
if (atomic_dec_and_test(&xd->refcnt)) {
|
|
unload_xattr_datum(c, xd);
|
|
jffs2_free_xattr_datum(xd);
|
|
}
|
|
jffs2_free_xattr_ref(ref);
|
|
}
|
|
ic->xref = NULL;
|
|
up_write(&c->xattr_sem);
|
|
}
|
|
|
|
static int check_xattr_ref_inode(struct jffs2_sb_info *c, struct jffs2_inode_cache *ic)
|
|
{
|
|
/* success of check_xattr_ref_inode() means taht inode (ic) dose not have
|
|
* duplicate name/value pairs. If duplicate name/value pair would be found,
|
|
* one will be removed.
|
|
*/
|
|
struct jffs2_xattr_ref *ref, *cmp, **pref, **pcmp;
|
|
int rc = 0;
|
|
|
|
if (likely(ic->flags & INO_FLAGS_XATTR_CHECKED))
|
|
return 0;
|
|
down_write(&c->xattr_sem);
|
|
retry:
|
|
rc = 0;
|
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
|
|
if (!ref->xd->xname) {
|
|
rc = load_xattr_datum(c, ref->xd);
|
|
if (unlikely(rc > 0)) {
|
|
*pref = ref->next;
|
|
delete_xattr_ref(c, ref);
|
|
goto retry;
|
|
} else if (unlikely(rc < 0))
|
|
goto out;
|
|
}
|
|
for (cmp=ref->next, pcmp=&ref->next; cmp; pcmp=&cmp->next, cmp=cmp->next) {
|
|
if (!cmp->xd->xname) {
|
|
ref->xd->flags |= JFFS2_XFLAGS_BIND;
|
|
rc = load_xattr_datum(c, cmp->xd);
|
|
ref->xd->flags &= ~JFFS2_XFLAGS_BIND;
|
|
if (unlikely(rc > 0)) {
|
|
*pcmp = cmp->next;
|
|
delete_xattr_ref(c, cmp);
|
|
goto retry;
|
|
} else if (unlikely(rc < 0))
|
|
goto out;
|
|
}
|
|
if (ref->xd->xprefix == cmp->xd->xprefix
|
|
&& !strcmp(ref->xd->xname, cmp->xd->xname)) {
|
|
if (ref->xseqno > cmp->xseqno) {
|
|
*pcmp = cmp->next;
|
|
delete_xattr_ref(c, cmp);
|
|
} else {
|
|
*pref = ref->next;
|
|
delete_xattr_ref(c, ref);
|
|
}
|
|
goto retry;
|
|
}
|
|
}
|
|
}
|
|
ic->flags |= INO_FLAGS_XATTR_CHECKED;
|
|
out:
|
|
up_write(&c->xattr_sem);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* -------- xattr subsystem functions ---------------
|
|
* jffs2_init_xattr_subsystem(c)
|
|
* is used to initialize semaphore and list_head, and some variables.
|
|
* jffs2_find_xattr_datum(c, xid)
|
|
* is used to lookup xdatum while scanning process.
|
|
* jffs2_clear_xattr_subsystem(c)
|
|
* is used to release any xattr related objects.
|
|
* jffs2_build_xattr_subsystem(c)
|
|
* is used to associate xdatum and xref while super block building process.
|
|
* jffs2_setup_xattr_datum(c, xid, version)
|
|
* is used to insert xdatum while scanning process.
|
|
* -------------------------------------------------- */
|
|
void jffs2_init_xattr_subsystem(struct jffs2_sb_info *c)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i < XATTRINDEX_HASHSIZE; i++)
|
|
INIT_LIST_HEAD(&c->xattrindex[i]);
|
|
INIT_LIST_HEAD(&c->xattr_unchecked);
|
|
INIT_LIST_HEAD(&c->xattr_dead_list);
|
|
c->xref_dead_list = NULL;
|
|
c->xref_temp = NULL;
|
|
|
|
init_rwsem(&c->xattr_sem);
|
|
c->highest_xid = 0;
|
|
c->highest_xseqno = 0;
|
|
c->xdatum_mem_usage = 0;
|
|
c->xdatum_mem_threshold = 32 * 1024; /* Default 32KB */
|
|
}
|
|
|
|
static struct jffs2_xattr_datum *jffs2_find_xattr_datum(struct jffs2_sb_info *c, uint32_t xid)
|
|
{
|
|
struct jffs2_xattr_datum *xd;
|
|
int i = xid % XATTRINDEX_HASHSIZE;
|
|
|
|
/* It's only used in scanning/building process. */
|
|
BUG_ON(!(c->flags & (JFFS2_SB_FLAG_SCANNING|JFFS2_SB_FLAG_BUILDING)));
|
|
|
|
list_for_each_entry(xd, &c->xattrindex[i], xindex) {
|
|
if (xd->xid==xid)
|
|
return xd;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void jffs2_clear_xattr_subsystem(struct jffs2_sb_info *c)
|
|
{
|
|
struct jffs2_xattr_datum *xd, *_xd;
|
|
struct jffs2_xattr_ref *ref, *_ref;
|
|
int i;
|
|
|
|
for (ref=c->xref_temp; ref; ref = _ref) {
|
|
_ref = ref->next;
|
|
jffs2_free_xattr_ref(ref);
|
|
}
|
|
|
|
for (ref=c->xref_dead_list; ref; ref = _ref) {
|
|
_ref = ref->next;
|
|
jffs2_free_xattr_ref(ref);
|
|
}
|
|
|
|
for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
|
|
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
|
|
list_del(&xd->xindex);
|
|
if (xd->xname)
|
|
kfree(xd->xname);
|
|
jffs2_free_xattr_datum(xd);
|
|
}
|
|
}
|
|
|
|
list_for_each_entry_safe(xd, _xd, &c->xattr_dead_list, xindex) {
|
|
list_del(&xd->xindex);
|
|
jffs2_free_xattr_datum(xd);
|
|
}
|
|
}
|
|
|
|
#define XREF_TMPHASH_SIZE (128)
|
|
void jffs2_build_xattr_subsystem(struct jffs2_sb_info *c)
|
|
{
|
|
struct jffs2_xattr_ref *ref, *_ref;
|
|
struct jffs2_xattr_ref *xref_tmphash[XREF_TMPHASH_SIZE];
|
|
struct jffs2_xattr_datum *xd, *_xd;
|
|
struct jffs2_inode_cache *ic;
|
|
struct jffs2_raw_node_ref *raw;
|
|
int i, xdatum_count = 0, xdatum_unchecked_count = 0, xref_count = 0;
|
|
int xdatum_orphan_count = 0, xref_orphan_count = 0, xref_dead_count = 0;
|
|
|
|
BUG_ON(!(c->flags & JFFS2_SB_FLAG_BUILDING));
|
|
|
|
/* Phase.1 : Merge same xref */
|
|
for (i=0; i < XREF_TMPHASH_SIZE; i++)
|
|
xref_tmphash[i] = NULL;
|
|
for (ref=c->xref_temp; ref; ref=_ref) {
|
|
struct jffs2_xattr_ref *tmp;
|
|
|
|
_ref = ref->next;
|
|
if (ref_flags(ref->node) != REF_PRISTINE) {
|
|
if (verify_xattr_ref(c, ref)) {
|
|
BUG_ON(ref->node->next_in_ino != (void *)ref);
|
|
ref->node->next_in_ino = NULL;
|
|
jffs2_mark_node_obsolete(c, ref->node);
|
|
jffs2_free_xattr_ref(ref);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
i = (ref->ino ^ ref->xid) % XREF_TMPHASH_SIZE;
|
|
for (tmp=xref_tmphash[i]; tmp; tmp=tmp->next) {
|
|
if (tmp->ino == ref->ino && tmp->xid == ref->xid)
|
|
break;
|
|
}
|
|
if (tmp) {
|
|
raw = ref->node;
|
|
if (ref->xseqno > tmp->xseqno) {
|
|
tmp->xseqno = ref->xseqno;
|
|
raw->next_in_ino = tmp->node;
|
|
tmp->node = raw;
|
|
} else {
|
|
raw->next_in_ino = tmp->node->next_in_ino;
|
|
tmp->node->next_in_ino = raw;
|
|
}
|
|
jffs2_free_xattr_ref(ref);
|
|
continue;
|
|
} else {
|
|
ref->next = xref_tmphash[i];
|
|
xref_tmphash[i] = ref;
|
|
}
|
|
}
|
|
c->xref_temp = NULL;
|
|
|
|
/* Phase.2 : Bind xref with inode_cache and xattr_datum */
|
|
for (i=0; i < XREF_TMPHASH_SIZE; i++) {
|
|
for (ref=xref_tmphash[i]; ref; ref=_ref) {
|
|
xref_count++;
|
|
_ref = ref->next;
|
|
if (is_xattr_ref_dead(ref)) {
|
|
ref->next = c->xref_dead_list;
|
|
c->xref_dead_list = ref;
|
|
xref_dead_count++;
|
|
continue;
|
|
}
|
|
/* At this point, ref->xid and ref->ino contain XID and inode number.
|
|
ref->xd and ref->ic are not valid yet. */
|
|
xd = jffs2_find_xattr_datum(c, ref->xid);
|
|
ic = jffs2_get_ino_cache(c, ref->ino);
|
|
if (!xd || !ic) {
|
|
dbg_xattr("xref(ino=%u, xid=%u, xseqno=%u) is orphan.\n",
|
|
ref->ino, ref->xid, ref->xseqno);
|
|
ref->xseqno |= XREF_DELETE_MARKER;
|
|
ref->next = c->xref_dead_list;
|
|
c->xref_dead_list = ref;
|
|
xref_orphan_count++;
|
|
continue;
|
|
}
|
|
ref->xd = xd;
|
|
ref->ic = ic;
|
|
atomic_inc(&xd->refcnt);
|
|
ref->next = ic->xref;
|
|
ic->xref = ref;
|
|
}
|
|
}
|
|
|
|
/* Phase.3 : Link unchecked xdatum to xattr_unchecked list */
|
|
for (i=0; i < XATTRINDEX_HASHSIZE; i++) {
|
|
list_for_each_entry_safe(xd, _xd, &c->xattrindex[i], xindex) {
|
|
xdatum_count++;
|
|
list_del_init(&xd->xindex);
|
|
if (!atomic_read(&xd->refcnt)) {
|
|
dbg_xattr("xdatum(xid=%u, version=%u) is orphan.\n",
|
|
xd->xid, xd->version);
|
|
xd->flags |= JFFS2_XFLAGS_DEAD;
|
|
list_add(&xd->xindex, &c->xattr_unchecked);
|
|
xdatum_orphan_count++;
|
|
continue;
|
|
}
|
|
if (is_xattr_datum_unchecked(c, xd)) {
|
|
dbg_xattr("unchecked xdatum(xid=%u, version=%u)\n",
|
|
xd->xid, xd->version);
|
|
list_add(&xd->xindex, &c->xattr_unchecked);
|
|
xdatum_unchecked_count++;
|
|
}
|
|
}
|
|
}
|
|
/* build complete */
|
|
JFFS2_NOTICE("complete building xattr subsystem, %u of xdatum"
|
|
" (%u unchecked, %u orphan) and "
|
|
"%u of xref (%u dead, %u orphan) found.\n",
|
|
xdatum_count, xdatum_unchecked_count, xdatum_orphan_count,
|
|
xref_count, xref_dead_count, xref_orphan_count);
|
|
}
|
|
|
|
struct jffs2_xattr_datum *jffs2_setup_xattr_datum(struct jffs2_sb_info *c,
|
|
uint32_t xid, uint32_t version)
|
|
{
|
|
struct jffs2_xattr_datum *xd;
|
|
|
|
xd = jffs2_find_xattr_datum(c, xid);
|
|
if (!xd) {
|
|
xd = jffs2_alloc_xattr_datum();
|
|
if (!xd)
|
|
return ERR_PTR(-ENOMEM);
|
|
xd->xid = xid;
|
|
xd->version = version;
|
|
if (xd->xid > c->highest_xid)
|
|
c->highest_xid = xd->xid;
|
|
list_add_tail(&xd->xindex, &c->xattrindex[xid % XATTRINDEX_HASHSIZE]);
|
|
}
|
|
return xd;
|
|
}
|
|
|
|
/* -------- xattr subsystem functions ---------------
|
|
* xprefix_to_handler(xprefix)
|
|
* is used to translate xprefix into xattr_handler.
|
|
* jffs2_listxattr(dentry, buffer, size)
|
|
* is an implementation of listxattr handler on jffs2.
|
|
* do_jffs2_getxattr(inode, xprefix, xname, buffer, size)
|
|
* is an implementation of getxattr handler on jffs2.
|
|
* do_jffs2_setxattr(inode, xprefix, xname, buffer, size, flags)
|
|
* is an implementation of setxattr handler on jffs2.
|
|
* -------------------------------------------------- */
|
|
struct xattr_handler *jffs2_xattr_handlers[] = {
|
|
&jffs2_user_xattr_handler,
|
|
#ifdef CONFIG_JFFS2_FS_SECURITY
|
|
&jffs2_security_xattr_handler,
|
|
#endif
|
|
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
|
|
&jffs2_acl_access_xattr_handler,
|
|
&jffs2_acl_default_xattr_handler,
|
|
#endif
|
|
&jffs2_trusted_xattr_handler,
|
|
NULL
|
|
};
|
|
|
|
static struct xattr_handler *xprefix_to_handler(int xprefix) {
|
|
struct xattr_handler *ret;
|
|
|
|
switch (xprefix) {
|
|
case JFFS2_XPREFIX_USER:
|
|
ret = &jffs2_user_xattr_handler;
|
|
break;
|
|
#ifdef CONFIG_JFFS2_FS_SECURITY
|
|
case JFFS2_XPREFIX_SECURITY:
|
|
ret = &jffs2_security_xattr_handler;
|
|
break;
|
|
#endif
|
|
#ifdef CONFIG_JFFS2_FS_POSIX_ACL
|
|
case JFFS2_XPREFIX_ACL_ACCESS:
|
|
ret = &jffs2_acl_access_xattr_handler;
|
|
break;
|
|
case JFFS2_XPREFIX_ACL_DEFAULT:
|
|
ret = &jffs2_acl_default_xattr_handler;
|
|
break;
|
|
#endif
|
|
case JFFS2_XPREFIX_TRUSTED:
|
|
ret = &jffs2_trusted_xattr_handler;
|
|
break;
|
|
default:
|
|
ret = NULL;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
ssize_t jffs2_listxattr(struct dentry *dentry, char *buffer, size_t size)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
|
|
struct jffs2_inode_cache *ic = f->inocache;
|
|
struct jffs2_xattr_ref *ref, **pref;
|
|
struct jffs2_xattr_datum *xd;
|
|
struct xattr_handler *xhandle;
|
|
ssize_t len, rc;
|
|
int retry = 0;
|
|
|
|
rc = check_xattr_ref_inode(c, ic);
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
down_read(&c->xattr_sem);
|
|
retry:
|
|
len = 0;
|
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
|
|
BUG_ON(ref->ic != ic);
|
|
xd = ref->xd;
|
|
if (!xd->xname) {
|
|
/* xdatum is unchached */
|
|
if (!retry) {
|
|
retry = 1;
|
|
up_read(&c->xattr_sem);
|
|
down_write(&c->xattr_sem);
|
|
goto retry;
|
|
} else {
|
|
rc = load_xattr_datum(c, xd);
|
|
if (unlikely(rc > 0)) {
|
|
*pref = ref->next;
|
|
delete_xattr_ref(c, ref);
|
|
goto retry;
|
|
} else if (unlikely(rc < 0))
|
|
goto out;
|
|
}
|
|
}
|
|
xhandle = xprefix_to_handler(xd->xprefix);
|
|
if (!xhandle)
|
|
continue;
|
|
if (buffer) {
|
|
rc = xhandle->list(inode, buffer+len, size-len, xd->xname, xd->name_len);
|
|
} else {
|
|
rc = xhandle->list(inode, NULL, 0, xd->xname, xd->name_len);
|
|
}
|
|
if (rc < 0)
|
|
goto out;
|
|
len += rc;
|
|
}
|
|
rc = len;
|
|
out:
|
|
if (!retry) {
|
|
up_read(&c->xattr_sem);
|
|
} else {
|
|
up_write(&c->xattr_sem);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int do_jffs2_getxattr(struct inode *inode, int xprefix, const char *xname,
|
|
char *buffer, size_t size)
|
|
{
|
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
|
|
struct jffs2_inode_cache *ic = f->inocache;
|
|
struct jffs2_xattr_datum *xd;
|
|
struct jffs2_xattr_ref *ref, **pref;
|
|
int rc, retry = 0;
|
|
|
|
rc = check_xattr_ref_inode(c, ic);
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
down_read(&c->xattr_sem);
|
|
retry:
|
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
|
|
BUG_ON(ref->ic!=ic);
|
|
|
|
xd = ref->xd;
|
|
if (xd->xprefix != xprefix)
|
|
continue;
|
|
if (!xd->xname) {
|
|
/* xdatum is unchached */
|
|
if (!retry) {
|
|
retry = 1;
|
|
up_read(&c->xattr_sem);
|
|
down_write(&c->xattr_sem);
|
|
goto retry;
|
|
} else {
|
|
rc = load_xattr_datum(c, xd);
|
|
if (unlikely(rc > 0)) {
|
|
*pref = ref->next;
|
|
delete_xattr_ref(c, ref);
|
|
goto retry;
|
|
} else if (unlikely(rc < 0)) {
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
if (!strcmp(xname, xd->xname)) {
|
|
rc = xd->value_len;
|
|
if (buffer) {
|
|
if (size < rc) {
|
|
rc = -ERANGE;
|
|
} else {
|
|
memcpy(buffer, xd->xvalue, rc);
|
|
}
|
|
}
|
|
goto out;
|
|
}
|
|
}
|
|
rc = -ENODATA;
|
|
out:
|
|
if (!retry) {
|
|
up_read(&c->xattr_sem);
|
|
} else {
|
|
up_write(&c->xattr_sem);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int do_jffs2_setxattr(struct inode *inode, int xprefix, const char *xname,
|
|
const char *buffer, size_t size, int flags)
|
|
{
|
|
struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
|
|
struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
|
|
struct jffs2_inode_cache *ic = f->inocache;
|
|
struct jffs2_xattr_datum *xd;
|
|
struct jffs2_xattr_ref *ref, *newref, **pref;
|
|
uint32_t length, request;
|
|
int rc;
|
|
|
|
rc = check_xattr_ref_inode(c, ic);
|
|
if (unlikely(rc))
|
|
return rc;
|
|
|
|
request = PAD(sizeof(struct jffs2_raw_xattr) + strlen(xname) + 1 + size);
|
|
rc = jffs2_reserve_space(c, request, &length,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_XATTR_SIZE);
|
|
if (rc) {
|
|
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
|
|
return rc;
|
|
}
|
|
|
|
/* Find existing xattr */
|
|
down_write(&c->xattr_sem);
|
|
retry:
|
|
for (ref=ic->xref, pref=&ic->xref; ref; pref=&ref->next, ref=ref->next) {
|
|
xd = ref->xd;
|
|
if (xd->xprefix != xprefix)
|
|
continue;
|
|
if (!xd->xname) {
|
|
rc = load_xattr_datum(c, xd);
|
|
if (unlikely(rc > 0)) {
|
|
*pref = ref->next;
|
|
delete_xattr_ref(c, ref);
|
|
goto retry;
|
|
} else if (unlikely(rc < 0))
|
|
goto out;
|
|
}
|
|
if (!strcmp(xd->xname, xname)) {
|
|
if (flags & XATTR_CREATE) {
|
|
rc = -EEXIST;
|
|
goto out;
|
|
}
|
|
if (!buffer) {
|
|
ref->ino = ic->ino;
|
|
ref->xid = xd->xid;
|
|
ref->xseqno |= XREF_DELETE_MARKER;
|
|
rc = save_xattr_ref(c, ref);
|
|
if (!rc) {
|
|
*pref = ref->next;
|
|
spin_lock(&c->erase_completion_lock);
|
|
ref->next = c->xref_dead_list;
|
|
c->xref_dead_list = ref;
|
|
spin_unlock(&c->erase_completion_lock);
|
|
unrefer_xattr_datum(c, xd);
|
|
} else {
|
|
ref->ic = ic;
|
|
ref->xd = xd;
|
|
ref->xseqno &= ~XREF_DELETE_MARKER;
|
|
}
|
|
goto out;
|
|
}
|
|
goto found;
|
|
}
|
|
}
|
|
/* not found */
|
|
if (flags & XATTR_REPLACE) {
|
|
rc = -ENODATA;
|
|
goto out;
|
|
}
|
|
if (!buffer) {
|
|
rc = -ENODATA;
|
|
goto out;
|
|
}
|
|
found:
|
|
xd = create_xattr_datum(c, xprefix, xname, buffer, size);
|
|
if (IS_ERR(xd)) {
|
|
rc = PTR_ERR(xd);
|
|
goto out;
|
|
}
|
|
up_write(&c->xattr_sem);
|
|
jffs2_complete_reservation(c);
|
|
|
|
/* create xattr_ref */
|
|
request = PAD(sizeof(struct jffs2_raw_xref));
|
|
rc = jffs2_reserve_space(c, request, &length,
|
|
ALLOC_NORMAL, JFFS2_SUMMARY_XREF_SIZE);
|
|
down_write(&c->xattr_sem);
|
|
if (rc) {
|
|
JFFS2_WARNING("jffs2_reserve_space()=%d, request=%u\n", rc, request);
|
|
unrefer_xattr_datum(c, xd);
|
|
up_write(&c->xattr_sem);
|
|
return rc;
|
|
}
|
|
if (ref)
|
|
*pref = ref->next;
|
|
newref = create_xattr_ref(c, ic, xd);
|
|
if (IS_ERR(newref)) {
|
|
if (ref) {
|
|
ref->next = ic->xref;
|
|
ic->xref = ref;
|
|
}
|
|
rc = PTR_ERR(newref);
|
|
unrefer_xattr_datum(c, xd);
|
|
} else if (ref) {
|
|
delete_xattr_ref(c, ref);
|
|
}
|
|
out:
|
|
up_write(&c->xattr_sem);
|
|
jffs2_complete_reservation(c);
|
|
return rc;
|
|
}
|
|
|
|
/* -------- garbage collector functions -------------
|
|
* jffs2_garbage_collect_xattr_datum(c, xd, raw)
|
|
* is used to move xdatum into new node.
|
|
* jffs2_garbage_collect_xattr_ref(c, ref, raw)
|
|
* is used to move xref into new node.
|
|
* jffs2_verify_xattr(c)
|
|
* is used to call do_verify_xattr_datum() before garbage collecting.
|
|
* jffs2_release_xattr_datum(c, xd)
|
|
* is used to release an in-memory object of xdatum.
|
|
* jffs2_release_xattr_ref(c, ref)
|
|
* is used to release an in-memory object of xref.
|
|
* -------------------------------------------------- */
|
|
int jffs2_garbage_collect_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd,
|
|
struct jffs2_raw_node_ref *raw)
|
|
{
|
|
uint32_t totlen, length, old_ofs;
|
|
int rc = 0;
|
|
|
|
down_write(&c->xattr_sem);
|
|
if (xd->node != raw)
|
|
goto out;
|
|
if (xd->flags & (JFFS2_XFLAGS_DEAD|JFFS2_XFLAGS_INVALID))
|
|
goto out;
|
|
|
|
rc = load_xattr_datum(c, xd);
|
|
if (unlikely(rc)) {
|
|
rc = (rc > 0) ? 0 : rc;
|
|
goto out;
|
|
}
|
|
old_ofs = ref_offset(xd->node);
|
|
totlen = PAD(sizeof(struct jffs2_raw_xattr)
|
|
+ xd->name_len + 1 + xd->value_len);
|
|
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XATTR_SIZE);
|
|
if (rc) {
|
|
JFFS2_WARNING("jffs2_reserve_space_gc()=%d, request=%u\n", rc, totlen);
|
|
goto out;
|
|
}
|
|
rc = save_xattr_datum(c, xd);
|
|
if (!rc)
|
|
dbg_xattr("xdatum (xid=%u, version=%u) GC'ed from %#08x to %08x\n",
|
|
xd->xid, xd->version, old_ofs, ref_offset(xd->node));
|
|
out:
|
|
if (!rc)
|
|
jffs2_mark_node_obsolete(c, raw);
|
|
up_write(&c->xattr_sem);
|
|
return rc;
|
|
}
|
|
|
|
int jffs2_garbage_collect_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref,
|
|
struct jffs2_raw_node_ref *raw)
|
|
{
|
|
uint32_t totlen, length, old_ofs;
|
|
int rc = 0;
|
|
|
|
down_write(&c->xattr_sem);
|
|
BUG_ON(!ref->node);
|
|
|
|
if (ref->node != raw)
|
|
goto out;
|
|
if (is_xattr_ref_dead(ref) && (raw->next_in_ino == (void *)ref))
|
|
goto out;
|
|
|
|
old_ofs = ref_offset(ref->node);
|
|
totlen = ref_totlen(c, c->gcblock, ref->node);
|
|
|
|
rc = jffs2_reserve_space_gc(c, totlen, &length, JFFS2_SUMMARY_XREF_SIZE);
|
|
if (rc) {
|
|
JFFS2_WARNING("%s: jffs2_reserve_space_gc() = %d, request = %u\n",
|
|
__FUNCTION__, rc, totlen);
|
|
rc = rc ? rc : -EBADFD;
|
|
goto out;
|
|
}
|
|
rc = save_xattr_ref(c, ref);
|
|
if (!rc)
|
|
dbg_xattr("xref (ino=%u, xid=%u) GC'ed from %#08x to %08x\n",
|
|
ref->ic->ino, ref->xd->xid, old_ofs, ref_offset(ref->node));
|
|
out:
|
|
if (!rc)
|
|
jffs2_mark_node_obsolete(c, raw);
|
|
up_write(&c->xattr_sem);
|
|
return rc;
|
|
}
|
|
|
|
int jffs2_verify_xattr(struct jffs2_sb_info *c)
|
|
{
|
|
struct jffs2_xattr_datum *xd, *_xd;
|
|
struct jffs2_eraseblock *jeb;
|
|
struct jffs2_raw_node_ref *raw;
|
|
uint32_t totlen;
|
|
int rc;
|
|
|
|
down_write(&c->xattr_sem);
|
|
list_for_each_entry_safe(xd, _xd, &c->xattr_unchecked, xindex) {
|
|
rc = do_verify_xattr_datum(c, xd);
|
|
if (rc < 0)
|
|
continue;
|
|
list_del_init(&xd->xindex);
|
|
spin_lock(&c->erase_completion_lock);
|
|
for (raw=xd->node; raw != (void *)xd; raw=raw->next_in_ino) {
|
|
if (ref_flags(raw) != REF_UNCHECKED)
|
|
continue;
|
|
jeb = &c->blocks[ref_offset(raw) / c->sector_size];
|
|
totlen = PAD(ref_totlen(c, jeb, raw));
|
|
c->unchecked_size -= totlen; c->used_size += totlen;
|
|
jeb->unchecked_size -= totlen; jeb->used_size += totlen;
|
|
raw->flash_offset = ref_offset(raw)
|
|
| ((xd->node == (void *)raw) ? REF_PRISTINE : REF_NORMAL);
|
|
}
|
|
if (xd->flags & JFFS2_XFLAGS_DEAD)
|
|
list_add(&xd->xindex, &c->xattr_dead_list);
|
|
spin_unlock(&c->erase_completion_lock);
|
|
}
|
|
up_write(&c->xattr_sem);
|
|
return list_empty(&c->xattr_unchecked) ? 1 : 0;
|
|
}
|
|
|
|
void jffs2_release_xattr_datum(struct jffs2_sb_info *c, struct jffs2_xattr_datum *xd)
|
|
{
|
|
/* must be called under spin_lock(&c->erase_completion_lock) */
|
|
if (atomic_read(&xd->refcnt) || xd->node != (void *)xd)
|
|
return;
|
|
|
|
list_del(&xd->xindex);
|
|
jffs2_free_xattr_datum(xd);
|
|
}
|
|
|
|
void jffs2_release_xattr_ref(struct jffs2_sb_info *c, struct jffs2_xattr_ref *ref)
|
|
{
|
|
/* must be called under spin_lock(&c->erase_completion_lock) */
|
|
struct jffs2_xattr_ref *tmp, **ptmp;
|
|
|
|
if (ref->node != (void *)ref)
|
|
return;
|
|
|
|
for (tmp=c->xref_dead_list, ptmp=&c->xref_dead_list; tmp; ptmp=&tmp->next, tmp=tmp->next) {
|
|
if (ref == tmp) {
|
|
*ptmp = tmp->next;
|
|
break;
|
|
}
|
|
}
|
|
jffs2_free_xattr_ref(ref);
|
|
}
|